Don't want to feel like I'm shitting on Nintendo but the free giveaway theme by Nintendo is a lame Halloween theme that doesn't look very appealing at all.
Edit: title should be changed to "Nintendo gives away a theme for 2DS/3DS owners".
The code will expire on October 30, GMT 23:59. It's not on the Theme Shop so there's not even a price for it.
Edit: title should be changed to "Nintendo gives away a theme for 2DS/3DS owners".